Overview
The ZF 4656.073.026 3 WG 171 Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway machinery. This assembly serves as the central power distribution hub within the WG 171 series, managing torque flow from the engine to the driveline under demanding load cycles. The SKU 4656.073.026 integrates the main gear cluster, clutch packs, and hydraulic control passages into a single sealed unit, ensuring precise shift timing and minimal parasitic loss. It mounts directly between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, forming the structural backbone of the gearbox. This complete unit eliminates the need for piecemeal rebuilding, offering a direct swap solution for worn or failed transmissions.
Symptoms of Failure
- Delayed or harsh engagement: When the internal clutch packs or valve body wear, operators notice a pronounced lag between shifting and actual gear engagement, often accompanied by a jarring thud.
- Chronic oil leaks at the housing seam: Deterioration of the main seal or gasket between the assembly and the TRANSMISSION HOUSING results in visible fluid drips, especially after extended operation.
- Gear slipping under load: Worn internal splines or piston seals cause the transmission to lose torque transfer when climbing grades or pushing heavy material, leading to RPM flare without forward motion.
- Metal debris in the oil pan: Advanced wear of planetary gears or bearing surfaces generates metallic particles, often trapped by the SCREEN SHEET, indicating imminent internal failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.073.026 |
| Assembly Type | 3 WG 171 Powershift Transmission (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4656.073.026 / 3 WG 171 |
| Max Input Torque | 1,200 Nm |
| Oil Capacity | 12.5 liters (ATF Dexron III) |
Compatibility
This complete assembly is specifically designed for the ZF WG 171 series, but its core architecture is shared across several ZF powershift families. It is a direct fit for WG 171, WG 180, and WG 200 transmissions used in wheel loaders, telehandlers, and industrial tractors. The unit interfaces with the TUBE for hydraulic fluid routing and requires the HOUS.FRONT SECT for proper alignment. While primarily intended for WG 171 applications, it can be adapted to earlier WG 150 series with minor modifications to the bellhousing interface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and supports the complete assembly. |
| 4656301066 | HOUS.FRONT SECT | Front section housing that aligns the input shaft and torque converter. |
| 4656201015 | SCREEN SHEET | Fine mesh filter that captures debris before oil enters the valve body. |
| 4656301037 | TUBE | Hydraulic fluid conduit connecting the pump to the clutch control circuits. |
| 0634313514 | O-RING | Seals fluid passages between housing sections to prevent external leaks. |
| 0636100803 | CAP SCREW | M10 fastener securing the housing to the engine bellhousing. |
| 4656301042 | HOUSING REAR PART | Rear casing that supports the output shaft and PTO drive. |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise positioning of the front and rear housings. |
| 0636100801 | CAP SCREW | M12 bolt used to clamp the housing halves together. |
| 0636100160 | CAP SCREW | M8 fastener for securing the oil pan and screen assembly. |
Frequently Asked Questions
Q: Is the ZF 4656.073.026 a remanufactured or new unit?
A: This part is supplied as a new, complete assembly. It includes all internal clutches, seals, and bearings pre-installed and tested to OEM specifications.
Q: Can I install this unit without replacing the TRANSMISSION HOUSING?
A: Yes, provided the existing housing is free of cracks or severe wear. However, we recommend inspecting the TRANSMISSION HOUSING and the HOUS.FRONT SECT for damage during the swap.
Q: What is the typical lifespan of this assembly in a wheel loader?
A: Under normal operating conditions with proper maintenance, the 3 WG 171 assembly typically delivers 8,000 to 10,000 hours before requiring a major overhaul.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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